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A capacitive touchscreen panel consists of an insulator such as glass, coated with a transparent conductor (mostly indium tin oxide). As the human body is also a conductor, touching the surface of the screen results in a distortion of the body's electrostatic field, measurable as a change in capacitance. Unlike its resistive counterpart, capacitive touch screens must be touched by a human finger or some sort of conductive device being held by a human hand. The figure on the right from Electronic Design shows how does capacitive screens work. Examples of devices with capacitive touchscreens are the iPhone and the T-Mobile G1.

Advantages:

Higher clarity display (up to 90% optical transparency)

Supports multi-touch

High touch resolution

High sensitivity

Disadvantages:

Needs a human finger to register input. It is not possible to use this screen wearing gloves

Cannot be used in all weather scenarios

On touchscreen displays, multi-touch refers to the ability to simultaneously register three or more distinct positions of input touches. It is often used to describe other, more limited implementations, like Gesture-Enhanced Single-Touch, Dual-Touch or real Multi-Touch.

The most popular form are mobile devices (iPhone, iPod Touch), touchtables (Microsoft Surface) and walls. Both touchtables and touch walls project an image through acrylic or glass, and then back-light the image with LEDs. When a finger or an object touches the surface, causing the light to scatter, the reflection is caught with sensors or cameras that send the data to software which dictates response to the touch, depending on the type of reflection measured. Touch surfaces can also be made pressure-sensitive by the addition of a pressure-sensitive coating that flexes differently depending on how firmly it is pressed, altering the reflection

Handheld technologies use a panel that carries an electrical charge. When a finger touches the screen, the touch disrupts the panel's electrical field. The disruption is registered and sent to the software, which then initiates a response to the gesture

In the past few years, several companies have released products that use multi-touch. In an attempt to make the expensive technology more accessible, hobbyists have also published methods of constructing DIY touchscreens

How to Program Apps for the Android

Google's new mobile handset operating system will bring the same revolutionary mobile application development for android that happened has evolved with iPhone and the iPhone app store. For the first time any Java developer can build and sell Android apps and make money with Android application development. While the Droid apps are programmed in JAVE, if you are already a programmer in any programming language you should be able to build on the Android platform with Android software to create Android applications

Use the Google Android Developer Resources. The Android Developer guides have received high praise for their crisp explanations, tutorials and practice sessions. Start at the Android App Developer Resources website for both information and for tools. All tools downloads are available at this site

Visit the Android Apps Market to do some research. Once you feel you can build an Android application, go to the Android Market to get an idea of the breadth of functionality that others have programmed that you can reassemble into your new mobile application. Also, spend some time on the tabs labeled, 'top paid' and 'top free'. This will give you an idea of where the consumer interest is for mobile applications. Are the highest downloads games? Or are the highest Android downloads geospatial applications with Google maps? Look at the broad categories and functions that people are downloading from the Android Market

Build your first Android Application. The only way to do this is to start. With the tutorials and practice completed. With the developer environment downloaded and a simple first project identified. Start developing. If you need help, go to the Android Developers Blog but also look for Android Developer Communities that are springing up across the internet. There are a lot of people who are happy to share their experiences

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